Should you increase the file size (from 50MB) you can upload to a SharePoint list or library to accommodate large audio/video files (recorded webcasts)?
This is really a question whether you would use a web server or a web streaming server to make your audio/video files available to your users.
Here is a short summary of the pros and cons:
Other Sources: http://www.microsoft.com/windows/windowsmedia/compare/webservvstreamserv.aspx
